Set Screws Knurled Cup Point
What are Set Screws Knurled Cup Point?
Knurled cup point set screws are headless fasteners with a cup-shaped tip that has serrated ridges. The knurling increases bite on the mating surface to resist loosening in vibration-prone applications while keeping a low, flush profile.
Why choose Set Screws Knurled Cup Point
- Enhanced vibration resistance — serrated cup edges grip the surface and reduce back-out.
- Strong holding power — frictional bite resists rotation and axial slip on round shafts.
- Headless, low-profile design — sits flush or below the surface for tight clearances.
- Serviceable — common hex-socket drives allow precise torque in confined spaces.
Common applications for Set Screws Knurled Cup Point
- Securing collars, gears, sprockets, and pulleys subjected to vibration
- Automotive, motorcycle, and equipment assemblies
- Industrial machinery, jigs, fixtures, and instruments
- Semi-permanent installations requiring strong grip
Materials and finishes for Set Screws Knurled Cup Point
- Alloy steel black oxide for high strength in dry interior environments.
- 18-8 / 304 stainless steel for broad corrosion resistance.
- 316 stainless steel for marine/coastal or chloride exposure.
How to size and specify Set Screws Knurled Cup Point
Order by diameter × thread × overall length (e.g., 10-32 × 3/16″, 1/4″-20 × 3/8″, M6-1.0 × 8 mm). Choose UNC/UNF or metric ISO to match the tapped hole, and select the drive style (typically hex-socket) to suit your tools.
How Knurled Cup Point Set Screws compare to other point styles
- Knurled cup vs cup — knurled adds serrations for extra bite under vibration; standard cup marks less.
- Knurled cup vs flat — flat bears on a machined flat for minimal marring and frequent repositioning.
- Knurled cup vs cone — cone penetrates deepest for maximum location; may mark the shaft more.
- Knurled cup vs dog/half-dog — dog points index into a hole/slot for positive positioning rather than frictional grip.
Installation tips for Set Screws Knurled Cup Point
- Seat the hex key fully and tighten to the recommended torque for the size/material.
- Where possible, add a small flat on the shaft to improve anti-slip resistance.
- Use a suitable threadlocker or a jam set screw in high-vibration service.
- Avoid over-torque that can deform threads or excessively mark the mating surface.
Set Screws Knurled Cup Point FAQs
See the accordion below for quick answers on selection, sizing, materials, torque, and when knurled cup outperforms standard cup or flat points.
For high-vibration assemblies where extra bite is needed, collars, gears, pulleys, and fixtures on round shafts.
Choose knurled cup when vibration loosening is a concern; use standard cup when you want a strong hold with slightly less marking.
It intentionally bites the surface. Use a machined flat or consider a flat-point/soft-tip if you must minimize marking.
By diameter × thread × overall length (end-to-end). Match UNC/UNF or metric ISO to the tapped hole.
Black-oxide alloy for high strength indoors; 304 for general corrosion resistance; 316 for marine/coastal or chloride exposure.
Often recommended for vibration; a jam set screw can add further resistance.